Wicked and the Wallflower by Sarah MacLean

When Wicked Comes Calling . . .
When a mysterious stranger finds his way into her bedchamber and offers his help in landing a duke, Lady Felicity Faircloth agrees—on one condition. She’s seen enough of the world to believe in passion, and won’t accept a marriage without it.

The Wallflower Makes a Dangerous Bargain . . .
Bastard son of a duke and king of London’s dark streets, Devil has spent a lifetime wielding power and seizing opportunity, and the spinster wallflower is everything he needs to exact a revenge years in the making. All he must do is turn the plain little mouse into an irresistible temptress, set his trap, and destroy his enemy.

For the Promise of Passion . . .
But there’s nothing plain about Felicity Faircloth, who quickly decides she’d rather have Devil than another. Soon, Devil’s carefully laid plans are in chaos and he must choose between everything he’s ever wanted . . . and the only thing he’s ever desired.